diff --git a/README.md b/README.md
index 1faf404..151a893 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,6 @@
-# oidc-test
-used pyenv virtualenv 3.12.2 temp
\ No newline at end of file
+# OIDC Test
+[![codecov](https://codecov.io/github/nora-codecov/oidc-test/branch/main/graph/badge.svg?token=3BKZLJABVK)](https://codecov.io/github/nora-codecov/oidc-test)
+
+Running on python 3.12.2
+
+No apps, no tokens, no worries :sunglasses:
\ No newline at end of file
diff --git a/api/calculator/test_calculator.py b/api/calculator/test_calculator.py
index 4164bee..01443e4 100644
--- a/api/calculator/test_calculator.py
+++ b/api/calculator/test_calculator.py
@@ -28,3 +28,6 @@ def test_divide():
     assert Calculator.divide(1.0, 2.0) == 0.5
     assert Calculator.divide(0, 2.0) == 0
     assert Calculator.divide(-4, 2.0) == -2.0
+
+def test_divide_by_0():
+    assert Calculator.divide(2.0, 0) == 'Cannot divide by 0'